Keeping stimulation levels high and expenditure levels low.
Monday: Try Laughter Yoga at the Draper's Arms in Islington at 7pm (£5).
Tuesday: Play ingenious games with the Door in a Wall crew at the Book Club. Novel Entertainments registration starts at 6.30 for a 7pm start (£5 on the door).
Wednesday: Watch a documentary about Pop Art artist Richard Hamilton at Coldharbour Gallery, Camberwell, coinciding with the last day of current exhibition: The Day The Factory Died (photos of Andy Warhol's memorial service at St. Patrick's Cathedral in 1987) from 7pm (£4 adv, £5 on the door).
Thursday: Dress like something from space and you can get into the Spacetacular! for just £4 to see comedy, variety, science and stuff at Roxy Bar and Screen, Borough (£5 no costume).
London Fortean Society asks Are We All Doomed? and looks at 2012 and other prophecies at the Bell, E1 from 7.30pm (£3/2).
Friday: The National Army Museum hosts a War Horse Late, giving you an evening opportunity to see the exhibition from 5.30-9pm (free entry).
Saturday: Help clean up Brent Feeder Canal in NW10 between 10am-1pm.
Sunday: Attend the Conway Hall Sunday lecture: Bad Science Beyond the Western World from 11am (£3 on the door).
Check out our things to do in London for free page for more.